//
//  MainTabBar.swift
//  weibo
//
//  Created by apple on 16/2/20.
//  Copyright © 2016年 apple. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
    
    override init(frame: CGRect){
    
        super.init(frame: frame)
        self.addSubview(plusBtn)
        
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override func layoutSubviews() {
        super.layoutSubviews()
        
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
//        定义递增索引
        var index: CGFloat = 0
        //遍历子视图
        for subview in subviews {
            if subview.isKindOfClass(NSClassFromString("UITabBarButton")!){
            
            subview.frame = CGRectOffset(rect, w * index, 0)
                
                index += (index == 1 ? 2 : 1)
            
            }
        
        plusBtn.frame = CGRectOffset(rect, 2 * w, 0)
            
        }
    }
    
    
    lazy var plusBtn: UIButton = UIButton(backImageName: "tabbar_compose_button", imageName: "tabbar_compose_icon_add")

}
